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Which of the following causes a chemical change in matter rather than a physical change.
A new substance is formed and in a physical change no new substance is formed.
2
number of atoms
A precipitate formed
freezing water and burning coal
20
10
burning
How many elements are in water (H2O)?
A new substance is formed and in a physical change no new substance is formed.
2
number of atoms
A precipitate formed
freezing water and burning coal
20
10
burning
How many molecules are in 20NaCl?
A new substance is formed and in a physical change no new substance is formed.
2
number of atoms
A precipitate formed
freezing water and burning coal
20
10
burning
Which shows one example of a physical change and one example of a chemical change?
A new substance is formed and in a physical change no new substance is formed.
2
number of atoms
A precipitate formed
freezing water and burning coal
20
10
burning
The subscript in a chemical formula indicates the
A new substance is formed and in a physical change no new substance is formed.
2
number of atoms
A precipitate formed
freezing water and burning coal
20
10
burning
A chemical change is different than a physical change because in a chemical change __________.
A new substance is formed and in a physical change no new substance is formed.
2
number of atoms
A precipitate formed
freezing water and burning coal
20
10
burning
Matter can undergo both chemical and physical changes. What indicates that the change was definitely chemical?
A new substance is formed and in a physical change no new substance is formed.
2
number of atoms
A precipitate formed
freezing water and burning coal
20
10
burning
How many atoms of Hydrogen are present in 5H20?
A new substance is formed and in a physical change no new substance is formed.
2
number of atoms
A precipitate formed
freezing water and burning coal
20
10
burning
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